Personal Learning Networks allow users to access specific information realted to their field of study or their profession. It enables people to identify relevant information and put it in a central location for easy access. The example below is one I have created to support information that would be useful to a school librarian including several RSS feeds on library resources, technology and current events.

J Coleman's Pageflakes

Collaborative Bookmarks are used to keep all of your resources in one location. If you use a resource fairly often or even if it is one that you don't use often, but don't want to loose track of, then keeping it on a bookmark list can help. This way, you can pull up your bookmarking application and see all of your resources and you can also see resources from other people who share your interests. This is a great tool if you want to share resources with a colleague or friend with ease. Here is an example of a Google Bookmark.

https://www.google.com/bookmarks/l#!threadID=BDQAAAAAQAA